Did you make your own lists? If so, maybe it's due to spaces after your items in your lists.
That or you're having a bad day like everyone else. Maybe you could post your lists so that we can see anything wrong?
This. Check for trailing spaces, because unless you've specifically checked for them before, they WILL be there, and they'll render your whole list null. Best way to check is to copy/paste the thing into notepad, save it as text ANSI encoding. If there's a dialog box that talks about compatibility issues, it's because of the HTML   (non-breaking space), in the document.
i used the lists from the forum you posted earlier, the ones that were downloadable txt files on the second page. since i have a mac and don't have notepad, i didn't think i could make them myself since they have to be txt files?
I checked the lists, and with a cursory glance, I don't think anything's wrong with them. Check to make sure that the shop isn't full up (you can see how many items are in stock by looking at the lower right hand corner in the Abrosia window). Full up is around 24 items.
Also make sure that the shop ID corresponds with the list ID.